hospitals. i'm alexis christoforous and this is the "cbs morning news." if you're living with chronic migraine, your life is a game of chance. but what if the odds could be in your favor? botox® is an fda-approved treatment that significantly reduces headache days for adults with chronic migraine, 15 or more headache days a month, each lasting 4 hours or more. it's proven to actually prevent headache days. and it's injected by a doctor once every 3 months. the effects of botox® (onabotulinumtoxina) may spread hours to weeks after injection causing serious symptoms. alert your doctor right away, as difficulty swallowing, speaking, breathing, eye problems, or muscle weakness can be a sign of a life-threatening condition. side effects may include allergic reactions, neck and injection site pain, fatigue, and headache. don't take botox® if you have a skin infection. tell your doctor about your medical history, muscle or nerve conditions, and medications, including botulinum toxins, as these may increase the risk of serious side effects. the dose of botox® is not the same as other botulinum toxins.